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Faulty insulation

Faulty insulation

The mica strips stick up between segments, stopping the brushes making contact. This is caused by wear or arcing removing surface copper. One of the segments has also cracked.

Explained in

    Replacing dynamo brushes

    The carbon brushes are a sliding fit in oblong holders on the dynamo endplate. Coiled springs bear against the tops of the brushes to hold them in contact with the commutator. Read more